#
AIPS HELP file for ROTMEAS in 31DEC20

#### As of Sat Feb 22 16:10:25 2020

### HELP SECTION

ROTMEAS
Type: Adverb (real)
Use: Used to tell a task a rotation measure in radians per meter
squared.
Null value: 0 -> no rotation measure
Tasks:
SPLIT....Converts multi-source to single-source UV files with
calibration. It ROTMEAS is not zero, the output is forced
to IQUV or RR/LL/RL/LR Stokes and Q and U are corrected by
the rotation measure into the values they would have at 0
wavelength.
Qout = Uin sin(2D) + Qin cos(2D)
Uout = Uin cos(2D) - Qin sin(2D)
RLout = RLin (cos(2D) - j sin(2D))
LRout = LRin (cos(2D) + j sin(2D))
where j = sqrt(-1) and D = ROTMEAS * Lambda^2.

### EXPLAIN SECTION